[SLAC] [SLAC Pubs and Reports]

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SLAC-PUB-7817
Electron-Hose Instability in an Annular Plasma Sheath

Abstract

A relativistic electron beam propagating through an annular plasma sheath is subject to a transverse plasma-electron coupled electrostatic instability. From the linearized fluid equations, the beam-sheath interaction is resolved into three coupled equations. The corresponding wakefield is computed and the asymptotic linear evolution is noted. For illustration, numerical examples are given for a plasma accelerator employing such a sheath. While the coasting beam scalings are quite severe at low energy, single-bunch instability growth can in fact be reduced to nil, for a very high-gradient accelerator.

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